lunkhead

Don't be such a lunkhead—you left the keys in the locked car again.

别这么呆——你又把钥匙落在锁好的车里了。

That lunkhead at the counter kept asking the same question after I'd explained it three times.

柜台那个呆子在我解释了三次之后还在问同一个问题。

Only a lunkhead would try to fix a leaking pipe without turning off the water first.

只有呆子才会不先关水就修漏水管子。